Table 1.

Nerve Conduction Study 1-23-14

		Spontaneous action			Voluntary action
Muscle (innervation)	Interpretation	Fib	PSW	Fasc	Amp	Dur	Poly	Recruit
Right FDI (uln ramus profundus c8 T1)	S1 inact Neur	0/10	0/10	0	Normal	+	Normal	Normal
Right EDC (radial C7 c8)	Normal	0/10	0/10	0	Normal	Normal	Normal	Normal
Right triceps (radial c6 C7 c8)	S1 inact Neur	0/10	0/10	0	Normal	+	Normal	Normal
Right biceps (musculocutaneous C5 c6)	Normal	0/10	0/10	0	Normal	Normal	Normal	Normal
Right deltoid (ant) (axillary C5 c6)	Normal	0/10	0/10	0	Normal	Normal	Normal	Normal
Left medial gastroc (tibial S1 s2)	Mod subac Neur	3/10	3/10	0	Normal	+	+	Late
Right medial gastroc (tibial S1 s2)	Mod subac Neur	3/10	3/10	0	Normal	+	+	Late
Left AT (deep peroneal l4 L5)	Mod subac Neur	3/10	3/10	0	Normal	+	+	Late
Right AT (deep peroneal l4 L5)	Mod subac Neur	3/10	3/10	0	Normal	+	+	Late
Left vastus lateralis (femoral L2 L3 L4)	S1 inact Neur	0/10	0/10	0	Normal	+	Normal	Normal
Right vastus lateralis (femoral L2 L3 L4)	S1 inact Neur	0/10	0/10	0	+	+	Normal	Normal

Findings: Reduced bilateral peroneal and tibial compound muscle action potentials. The remainder of the nerve-conduction study is normal. Coincidental, mild, right wrist nerve lesion (carpal tunnel syndrome) with delayed median sensory potentials. Electromyography sampling shows diffuse denervation changes with both active and chronic features in both lower limbs and in the right upper limb. These features would be consistent with anterior horn-cell disease and meet the Awaji criteria for such a disorder.

Fib, fibulations; PSW, positive sharp wave; Fasc, fasiculation; Amp; amplitude; Dur, duration; Poly, polygraphy; FDI, first dorsal interosseus; EDC, extensor digitorium communis; ant, anterior; gastroc, gastrocnemius; AT, anterior tibialis; inact, inactive; Neur, neuropathy; Mod, moderate; subac, subacute.